hashlink 0.4.0

HashMap-like containers that hold their key-value pairs in a user controllable order
Documentation 
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## [0.4.0]
- API incompatible change: depend on hashbrown 0.6
- Passes miri

## [0.3.0]
- Add some *minimal* documentation for methods that change the internal ordering.
- Decide on a pattern for methods that change the internal ordering: the word
  "insert" means that it will move an existing entry to the back.
- Some methods have been renamed to conform to the above system.

## [0.2.1]
- Fix variance for LinkedHashMap (now covariant where appropriate)
- Add Debug impls to many more associated types
- Add LinkedHashSet
- Add `LinkedHashMap::retain`

## [0.2.0]
- Move `linked_hash_map` into its own module
- Add `LruCache` type ported from `lru-cache` crate into its own module
- Add `LruCache` entry and raw-entry API
- Add `linked_hash_map` `IntoIter` iterator that is different from `Drain` iterator
- Make `Drain` iterator recycle freed linked list nodes

## [0.1.0]
- Initial release